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                <blockquote>
<p>无论是日常开发还是在面试中，防抖与节流的知识都是需要掌握的点。对于初次接触到防抖节流的新手来讲，理解起来还是有些许困难。而网络上搜到的内容，大都乏善可陈，多是一些晦涩难懂的名词解释。鉴于此，同时也是为了巩固和复习知识点，将自己学习的一些内容记录下来，有不足之处，还望赐教指正。</p>
</blockquote>
<h3 id="防抖-Debounce"><a href="#防抖-Debounce" class="headerlink" title="防抖 (Debounce)"></a>防抖 (Debounce)</h3><blockquote>
<p>防抖：就其字面理解，防止抖动。事件触发一段时间内，程序只执行一次，而不是用户操作多少次，就执行多少次。</p>
</blockquote>
<p>举个例子：小明向爸爸要零花钱，爸爸把钱给了小明。第二天，小明又向爸爸要钱，爸爸装没听到，小明又连续要了几天，爸爸还是不管不问。后来妈妈告诉他，零花钱每周只能要一次。</p>
<p>而小明的同学小华问爸爸要零花钱时，爸爸不给，小华连续要了几次后，爸爸都是没反应，小华自己也不再吵着要了，这时，爸爸竟然把零花钱给了小华。</p>
<p>以上要零花钱可以看作是触发条件，而爸爸给钱可以视作执行。尽管小明和小华都是多次要钱，但零花钱每周只给一次。不同的是，小明爸爸是第一次要的时候就给了，而小华爸爸是等小华不再要时给的，这个可以看作程序的执行时机，是立即执行还是稍后执行。</p>
<h4 id="代码演示"><a href="#代码演示" class="headerlink" title="代码演示"></a>代码演示</h4><p>故事讲完了，现在看一段代码，梳理一下</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>con<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>CLICK TO CONSOLE<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> tar <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'con'</span><span class="token punctuation">)</span>
<span class="token keyword">function</span> <span class="token function">log</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'ok'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>

tar<span class="token punctuation">.</span>onclick <span class="token operator">=</span> log<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>以上是未做防抖的程序，执行效果如下</p>
<img src="https://s1.ax1x.com/2022/04/19/LDSYWT.gif" title="" alt="未作防抖处理的效果" data-align="center">

<p>可以发现，点击多少次，就输出多少次，这并不是我们想要的结果。</p>
<h4 id="简单实现"><a href="#简单实现" class="headerlink" title="简单实现"></a>简单实现</h4><p>我们手写一个Debounce方法，需要两个参数<code>cb</code>和&nbsp;&nbsp;<code>wait</code> ，分别为需要执行的方法和多久执行一次的时间。</p>
<p>思路：</p>
<ul>
<li><p>初始化时，将定时器设为null</p>
</li>
<li><p>当程序执行时，先将旧的定时器置清理，然后再开启新的定时器</p>
</li>
</ul>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">Debounce</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">cb<span class="token punctuation">,</span> wait</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">let</span> timer <span class="token operator">=</span> <span class="token keyword">null</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        timer <span class="token operator">=</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token function">cb</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> wait<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<pre class="line-numbers language-js" data-language="js"><code class="language-js">tar<span class="token punctuation">.</span>onclick <span class="token operator">=</span> <span class="token function">Debounce</span><span class="token punctuation">(</span>log<span class="token punctuation">,</span><span class="token number">500</span><span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p>至此，一个基本的防抖就完成了。但是我们可以进一步优化。</p>
<h4 id="参数优化"><a href="#参数优化" class="headerlink" title="参数优化"></a>参数优化</h4><p>我们需要的<code>cb</code>是一个函数类型，如果是其他类型的话，可以抛出错误，另外<code>wait</code>要是数字类型，也可以设定初始值。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">Debounce</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">cb<span class="token punctuation">,</span> wait</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// init params</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>cb<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> is not a function</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
    wait <span class="token operator">=</span> <span class="token operator">+</span>wait
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isNaN</span><span class="token punctuation">(</span>wait<span class="token punctuation">)</span><span class="token punctuation">)</span> wait <span class="token operator">=</span> <span class="token number">300</span>
    <span class="token comment">// handler</span>
    <span class="token keyword">let</span> timer <span class="token operator">=</span> <span class="token keyword">null</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span><span class="token operator">...</span><span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>另外，在执行时，我们可能需要用到<code>this</code>和其他参数，但返回的函数中的this与我们需要的this可能不一致，因此，我们也可以绑定一下&nbsp;&nbsp;<code>this</code> 。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>params</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token comment">// ...</span>
    <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="新增参数"><a href="#新增参数" class="headerlink" title="新增参数"></a>新增参数</h4><p>上面讲到，是第一个给钱还是稍后给钱，这个取决于用户的习性，因此，我们也可以给另一个参数<code>immediate</code>，值为布尔类型，含义为是否立即执行，给予更大自由性。同样的，需要对参数进行处理。</p>
<p>怎么样才立即执行呢？我们知道，零花钱一周给一次，给完后就将以前的计时清理掉，重新计时，因此，可以理解为：第一次要的时候，就立即执行。</p>
<p>那么，如何才知道是第一次触发呢？立即执行需要两个条件：1）没有计时器了    2）设定了立即执行为true。</p>
<p>因此，我们可以书写接下来的内容：</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">Debounce</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">cb<span class="token punctuation">,</span> wait<span class="token punctuation">,</span> immediate</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// init params</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeErro</span><span class="token template-string"><span class="token template-punctuation string">`</span><span class="token interpolation"><span class="token interpolation-punctuation punctuation">${</span>cb<span class="token interpolation-punctuation punctuation">}</span></span><span class="token string"> is not a function</span><span class="token template-punctuation string">`</span></span><span class="token punctuation">)</span>
    wait <span class="token operator">=</span> <span class="token operator">+</span>wait
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isNaN</span><span class="token punctuation">(</span>wait<span class="token punctuation">)</span><span class="token punctuation">)</span> wait <span class="token operator">=</span> <span class="token number">300</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> immediate <span class="token operator">!==</span> <span class="token string">'boolean'</span><span class="token punctuation">)</span> immediate <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>

    <span class="token comment">// handler</span>
    <span class="token keyword">let</span> timer <span class="token operator">=</span> <span class="token keyword">null</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>params</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">let</span> runNow <span class="token operator">=</span> <span class="token operator">!</span>timer <span class="token operator">&amp;&amp;</span> immediate<span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
           <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> wait<span class="token punctuation">)</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>runNow<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="定时器优化"><a href="#定时器优化" class="headerlink" title="定时器优化"></a>定时器优化</h4><p>分析以上代码，我们又发现，立即执行时，我们执行了一次，重开了一次计时器，到时间后自己又稍后执行了一次，这并不是我们想要的。我们要的时，立即执行后，在规定时间段内触发不做任何事情。因此，只有是非立即执行时，才去走计时器内的方法。</p>
<p>每次触发都会清理掉旧的计时器，但是最后一次的计时器并没有被清理掉，因此，执行完后，我们也需要将最后的计时器回收掉。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js">timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>immediate<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
    timer <span class="token operator">=</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span>
<span class="token punctuation">}</span><span class="token punctuation">,</span> wait<span class="token punctuation">)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>runNow<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h4 id="参数容错处理"><a href="#参数容错处理" class="headerlink" title="参数容错处理"></a>参数容错处理</h4><p>不同的人有不同的习惯，我们在传参时，能全部传入当然是最好的，但有时候疏忽大意，忘掉了一些，例如：忘了传<code>immediate</code>，我们已经做了优化给定了默认值。但是，我们有时候想要立即执行，传了true却将第二参数漏了，因此，我们需要对参数进行进一步的优化处理。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">Debounce</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">cb<span class="token punctuation">,</span> wait<span class="token punctuation">,</span> immediate</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// init params</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token string">'cb is not a function'</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> wait <span class="token operator">===</span> <span class="token string">'boolean'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        immediate <span class="token operator">=</span> wait
        wait <span class="token operator">=</span> <span class="token keyword">undefined</span>
    <span class="token punctuation">}</span>
    wait <span class="token operator">=</span> <span class="token operator">+</span>wait
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isNaN</span><span class="token punctuation">(</span>wait<span class="token punctuation">)</span><span class="token punctuation">)</span> wait <span class="token operator">=</span> <span class="token number">300</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> immediate <span class="token operator">!==</span> <span class="token string">'boolean'</span><span class="token punctuation">)</span> immediate <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>

    <span class="token comment">// handler</span>
    <span class="token keyword">let</span> timer <span class="token operator">=</span> <span class="token keyword">null</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>params</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">let</span> runNow <span class="token operator">=</span> <span class="token operator">!</span>timer <span class="token operator">&amp;&amp;</span> immediate<span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>immediate<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
            timer <span class="token operator">=</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> wait<span class="token punctuation">)</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>runNow<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>每次进入时都会执行一次<code>clearTimeout</code>，但我们每次执行完进入是没有计时器的，却也执行了一次，我们也可以稍作优化，创造一个函数来处理。</p>
<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">clearTimer</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">timer</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>timer<span class="token punctuation">)</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h4 id="效果演示"><a href="#效果演示" class="headerlink" title="效果演示"></a>效果演示</h4><p>到这里，防抖方法已经完成，看一下执行效果</p>
<ul>
<li>立即执行效果</li>
</ul>
<img src="https://s1.ax1x.com/2022/04/19/LDSGF0.gif" title="立即执行" alt="立即执行的效果" data-align="center">

<ul>
<li>稍后执行效果</li>
</ul>
<img src="https://s1.ax1x.com/2022/04/19/LDSJYV.gif" title="稍后执行" alt="稍后执行的效果" data-align="center">

<h4 id="完整代码"><a href="#完整代码" class="headerlink" title="完整代码"></a>完整代码</h4><p>附上完整代码</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>button</span> <span class="token attr-name">id</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>con<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span>CLICK TO CONSOLE<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>button</span><span class="token punctuation">&gt;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> tar <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">'con'</span><span class="token punctuation">)</span>
<span class="token keyword">function</span> <span class="token function">log</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">'ok'</span><span class="token punctuation">)</span>
<span class="token punctuation">}</span>
tar<span class="token punctuation">.</span>onclick <span class="token operator">=</span> <span class="token function">Debounce</span><span class="token punctuation">(</span>log<span class="token punctuation">,</span> <span class="token number">500</span><span class="token punctuation">,</span> <span class="token boolean">true</span><span class="token punctuation">)</span>
<span class="token comment">// tar.onclick = Debounce(log, 500)</span>
<span class="token comment">// tar.onclick = Debounce(log, true)</span>
<span class="token comment">// tar.onclick = Debounce(log)</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<pre class="line-numbers language-js" data-language="js"><code class="language-js"><span class="token keyword">const</span> <span class="token function-variable function">clearTimer</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">timer</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>timer<span class="token punctuation">)</span> <span class="token function">clearTimeout</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span>
    <span class="token keyword">return</span> <span class="token keyword">null</span>
<span class="token punctuation">}</span>

<span class="token comment">/**
 * Debounce
 * @param cb
 * @param wait
 * @param immediate
 * @returns {(function(...[*]): void)|*}
 * @constructor
 */</span>
<span class="token keyword">const</span> <span class="token function-variable function">Debounce</span> <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token parameter">cb<span class="token punctuation">,</span> wait<span class="token punctuation">,</span> immediate</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
    <span class="token comment">// init params</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> cb <span class="token operator">!==</span> <span class="token string">'function'</span><span class="token punctuation">)</span> <span class="token keyword">throw</span> <span class="token keyword">new</span> <span class="token class-name">TypeError</span><span class="token punctuation">(</span><span class="token string">'cb is not a function'</span><span class="token punctuation">)</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> wait <span class="token operator">===</span> <span class="token string">'boolean'</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        immediate <span class="token operator">=</span> wait
        wait <span class="token operator">=</span> <span class="token keyword">undefined</span>
    <span class="token punctuation">}</span>
    wait <span class="token operator">=</span> <span class="token operator">+</span>wait
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token function">isNaN</span><span class="token punctuation">(</span>wait<span class="token punctuation">)</span><span class="token punctuation">)</span> wait <span class="token operator">=</span> <span class="token number">300</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token keyword">typeof</span> immediate <span class="token operator">!==</span> <span class="token string">'boolean'</span><span class="token punctuation">)</span> immediate <span class="token operator">=</span> <span class="token boolean">false</span><span class="token punctuation">;</span>

    <span class="token comment">// handler</span>
    <span class="token keyword">let</span> timer <span class="token operator">=</span> <span class="token keyword">null</span>
    <span class="token keyword">return</span> <span class="token keyword">function</span> <span class="token punctuation">(</span><span class="token parameter"><span class="token operator">...</span>params</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">let</span> runNow <span class="token operator">=</span> <span class="token operator">!</span>timer <span class="token operator">&amp;&amp;</span> immediate<span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">clearTimer</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span><span class="token punctuation">;</span>
        timer <span class="token operator">=</span> <span class="token function">setTimeout</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>immediate<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
            timer <span class="token operator">=</span> <span class="token function">clearTimer</span><span class="token punctuation">(</span>timer<span class="token punctuation">)</span>
        <span class="token punctuation">}</span><span class="token punctuation">,</span> wait<span class="token punctuation">)</span>
        <span class="token keyword">if</span> <span class="token punctuation">(</span>runNow<span class="token punctuation">)</span> <span class="token function">cb</span><span class="token punctuation">.</span><span class="token function">call</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">,</span> <span class="token operator">...</span>params<span class="token punctuation">)</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

                
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$(function () {
    var searchFunc = function (path, search_id, content_id) {
        'use strict';
        $.ajax({
            url: path,
            dataType: "xml",
            success: function (xmlResponse) {
                // get the contents from search data
                var datas = $("entry", xmlResponse).map(function () {
                    return {
                        title: $("title", this).text(),
                        content: $("content", this).text(),
                        url: $("url", this).text()
                    };
                }).get();
                var $input = document.getElementById(search_id);
                var $resultContent = document.getElementById(content_id);
                $input.addEventListener('input', function () {
                    var str = '<ul class=\"search-result-list\">';
                    var keywords = this.value.trim().toLowerCase().split(/[\s\-]+/);
                    $resultContent.innerHTML = "";
                    if (this.value.trim().length <= 0) {
                        return;
                    }
                    // perform local searching
                    datas.forEach(function (data) {
                        var isMatch = true;
                        var data_title = data.title.trim().toLowerCase();
                        var data_content = data.content.trim().replace(/<[^>]+>/g, "").toLowerCase();
                        var data_url = data.url;
                        data_url = data_url.indexOf('/') === 0 ? data.url : '/' + data_url;
                        var index_title = -1;
                        var index_content = -1;
                        var first_occur = -1;
                        // only match artiles with not empty titles and contents
                        if (data_title !== '' && data_content !== '') {
                            keywords.forEach(function (keyword, i) {
                                index_title = data_title.indexOf(keyword);
                                index_content = data_content.indexOf(keyword);
                                if (index_title < 0 && index_content < 0) {
                                    isMatch = false;
                                } else {
                                    if (index_content < 0) {
                                        index_content = 0;
                                    }
                                    if (i === 0) {
                                        first_occur = index_content;
                                    }
                                }
                            });
                        }
                        // show search results
                        if (isMatch) {
                            str += "<li><a href='" + data_url + "' class='search-result-title'>" + data_title + "</a>";
                            var content = data.content.trim().replace(/<[^>]+>/g, "");
                            if (first_occur >= 0) {
                                // cut out 100 characters
                                var start = first_occur - 20;
                                var end = first_occur + 80;
                                if (start < 0) {
                                    start = 0;
                                }
                                if (start === 0) {
                                    end = 100;
                                }
                                if (end > content.length) {
                                    end = content.length;
                                }
                                var match_content = content.substr(start, end);
                                // highlight all keywords
                                keywords.forEach(function (keyword) {
                                    var regS = new RegExp(keyword, "gi");
                                    match_content = match_content.replace(regS, "<em class=\"search-keyword\">" + keyword + "</em>");
                                });

                                str += "<p class=\"search-result\">" + match_content + "...</p>"
                            }
                            str += "</li>";
                        }
                    });
                    str += "</ul>";
                    $resultContent.innerHTML = str;
                });
            }
        });
    };

    searchFunc('/search.xml', 'searchInput', 'searchResult');
});
</script>

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